Questions tagged [human-anatomy]

This tag is for questions about the general anatomical features of human beings as opposed to the anatomy of non-human animals.

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60 views

Are releasing-hormones and release-inhibiting hormones from the hypothalamus ever present in the blood?

Our teacher said that these two hormones are normally never present in the blood stream, and to be carfeul of it if it comes as a question. I'm not conviced to be honest, is this true?
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129 views

Anatomy of joints of human hand

Q) A girl slipped and is falling. She puts out her arms to prevent falling. Which joints are most affected by her fall? Fibrous and Synovial joints. Cartilagenous and Synovial joints. Fibrous and ...
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1answer
32 views

Using formulas to explain why contraction of blood vessels leads to increased blood pressure

I know, I know this is probably a question too simple to be asked on a forum like biology stack exchange. Problem is, I looked many places and can't seem to find a more mathematical approach to ...
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2answers
192 views

Are all of our hormones synthesized in the same gland that they are secreted from?

For example, growth hormone is secreted from the anterior pituitary; is it also synthesized there?
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1answer
149 views

Why hasn't evolution gotten rid of the appendix yet?

A figure I have recently stumbled upon suggests that about 7% of the world population will, or have, had appendicitis in their lifetime. Cutting out the appendix was impossible until very recently. ...
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1answer
60 views

What is the difference between how motor function is controlled in cerebrum vs frontal lobe?

At least according to wikipedia, the frontal lobe houses the primary motor cortex, but in a different article about the cerebellum, it says the cerebellum controls motor function. So, do both parts ...
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1answer
87 views

How can I verify my true genetic relationship with my close relatives with simple physical traits?

Question I don't know if it is ethical to ask a question like that, but I would like to know every simple physical trait that I can observe on me, my parents and my siblings which are regulated by a ...
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1answer
63 views

Is there human Anatomy software that provides great detail?

Is there Anatomy software that is exact representation of human body, like let's say virtual reality tour inside human body from head to foot, detailing all organs even small, covering all systems, ...
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0answers
60 views

Are there wounds which never completely heal?

I have a cut on a knuckle which occasionally opens (usually during winter), to disappear after some time (it is usually fine during the summer). This is going on for years now and yes, I will show ...
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0answers
22 views

Ingestion of cellulose digesting prokaryotes? [duplicate]

If humans digest cellulose digesting prokaryotes, can we start digesting cellulose like cows?
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1answer
1k views

HOW is the Gallbladder attached to the liver

The gallbladder’s function is to store bile from the liver which is delivered through the cystic (bile) duct. The cystic artery is also connected to the gallbladder to deliver blood. (Correct me if ...
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1answer
4k views

Why can't we move our toes and some fingers separately? [duplicate]

In our feet, other than the large toe, the other toes cannot be moved separately. If we try to move them, then all the four toes move together. We cannot move each toe by itself. Same thing occurs in ...
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2answers
55 views

Why do we have only one elbow per arm and one knee per leg, not multiple elbows or knees? [closed]

I was surfing on the internet for a long time, but I couldn't find the answer to my question: Why do we have only one elbow per arm and one knee per leg, not multiple elbows or multiple knees per limb?...
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15k views

Do women tend to have longer legs and shorter torsos than men?

I've always heard that women tend to have a greater leg length to torso length ration than men, and I think that my anecdotal observations of pedestrians of both sexes tend to confirm that. However, ...
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1answer
91 views

Why is the head/neck of the femur at that 120-150 degree angle?

I'm just wondering why the femur is such that there is that head and neck sticking out of the top at an angle, why it isn't just straight up into the hips?
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713 views

Humans have tails? [duplicate]

Today in biology class, my teacher said that all chordates have all the necessary traits, at least during the embryo stage, and we humans are chordates. So, one of these necessary traits was that they ...
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1answer
596 views

What is the “male gender rudiment” that women allegedly have?

In The Man without Qualities Robert Musil wrote (my emphasis): "But the nature," he thought, "gives the man nipples and the woman a male gender rudiment. We cannot conclude from this, however, ...
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Human spine: Is the coccyx really fused?

Prologue: This post is about the adult (say, a 20 year old) human skeleton; I'm not particularly interested in infant skeletons. The human spine has is composed of cervical, thoracic, lumbar, sacral ...
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1answer
68 views

What happens to the language processing brain part if no language is ever learned?

Language is processed in the human brain in multiple regions. Some of them seem to be used exclusively or mainly for language processing, other regions are distributed overlapping with other functions....
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2answers
443 views

Can you tell if a corpse was male or female by only examining its skull?

There are articles that says women have more rounded corner faces than men, than women noses are usually shorter, etc. But are those (and other features) tendencies or deterministic features that ...
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1answer
3k views

Ipsilateral vs contralateral side of body

I know that the dorsal columns carry ipsilateral information. Is this fact relative to the dorsal column in question? If I want to talk about the right dorsal column, then the right side of the body ...
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0answers
740 views

Strongest bone in body

AS internet tells is it is thigh bone which is strongest, but why, it carry only upper part of body, does not heel or any foot bones should be strongest in body as they carry full body weight ?
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1answer
900 views

Are centrioles really absent in human neurons?

A booklet (issued by my school) claims, Centrioles, formerly believed to be absent in neurons, have been described in neurons and may be associated with the production and maintenance of neuro(...
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1answer
382 views

How does kissing burst a person's ear drum?

A young Chinese woman was left partially deaf following a passionate kiss from her boyfriend. .. The kiss reduced pressure in the mouth, pulled the eardrum out and caused the breakdown of the ear. ...
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0answers
40 views

Are there nerve endings on or inside the corpus cavernosum/spongiosum? [duplicate]

The penile skin has many nerve endings, but what about the inner structure of the penis? There are two dorsal nerves on either cavernosum. But it is unknown whether these nerves provide sensitivity ...
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30 views

Muscle involved in carrying load on head

I have seen people carrying heavy load on their head especially in 3rd world countries, does carrying on head any benefit or harm, which muscle get strengthen in doing it?
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1answer
1k views

What is the function of the Hyoepiglottic ligament?

The hyoepiglottic ligament (ligamentum hyoepiglotticum) is an elastic band that connects the epiglottis to the hyoid bone. Although I can find information about the clinical significance of this ...
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2answers
120 views

What is the easiest way to measure a human body surface area? [closed]

Looking for accuracy, cost-efficiency, and speed.
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163 views

Alpha-gamma co-activation

I am having trouble visualizing/grasping the necessity of alpha-gamma co-activation. My understanding is the following: When an external load causes stretching of the sensory muscle spindles, the 1a ...
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1answer
186 views

Are there certain symmetric-pair muscles that are slightly bigger and NOT due to handedness?

Ok, hear me out, I was just thinking about an article in Nature I read in the past titled "Scrotal asymmetry in man and in ancient sculpture"$^{\dagger}$ and more recently an entire medical textbook ...
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60 views

What causes the blue color seen in baboons?

Based off of this question from Worldbuilding SE. In that question, I talked about how the scrotum and buttocks of various animals have a blue color because of thick deposits of collagen in those ...
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2answers
619 views

Why does the amount of adipose tissue contribute the most to the total body water amount in humans?

I don't quite get this concept. An obese individual will have a greater fat content in their body, and thus will have 45% water in their bodies (for example), versus a slim person that will have 75% ...
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1answer
143 views

Is the cranial nerve blood supply encapsulated by the blood brain barrier?

I understand the origin of cranial nerves are within the blood brain barrier. I'm assuming as they extend distally there's a point at which their vasculature is not encapsulated by the blood brain ...
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2answers
3k views

Terminology for parts of the leg

Going out on a limb here (pun intended)...I'm writing a paper in which I need to refer to various sections of the human leg from upper thigh to knee to calf and ankle. However, "calf" covers a fairly ...
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913 views

What is the difference between the otolith membrane and the endolymph?

The human vestibular system contains otoliths to sense acceleration in the vertical and horizontal plane. I cannot find what the difference is between the otolith membrane and the endolymph? Can ...
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93 views

Is there any evolutionary significance of downward facing nostrils in human beings?

The nostrils in apes and monkeys are almost at the front, but in humans nostrils (external nares) face downwards. Also a lot of non-primate mammals like goats have nostrils at the front. Is it the ...
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1answer
66 views

Where in the digestive tract are melatonin pills dissolved? Same question for gelatin capsules

I want to do a blind controlled experiment on myself to learn whether melatonin pills have any effects on me. I bought some empty gelatin capsules. I am going to fill some of them with rice and put ...
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2answers
453 views

Use of progesterone in preventing ovulation?

I have heard that progesterone in contraceptive pills or interuterine devices have been known to prevent ovulation. How is this possible since the LH and FSH are only affected by oestrogen not ...
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2answers
106 views

Is it possible for a man to survive around 20 bullets? [closed]

A man was shown being able to survive after around 20 bullets shot him in a movie. The bullet cover was fairly random, but anyway, is there any possible way for a person to survive 20 bullet shots? I'...
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770 views

Is the shape of the skull important for brain size?

I do not know biology, but I notice that human skull have a particular form that is like a upward spike and other skulls which are only oval. upward spike: oval: I know that in the example images ...
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2answers
128 views

What are the most efficient heat exchange sites on the human body?

Where on the body would be the best place to achieve the greatest cooling effect with a "cooling undergarment"? Concentrated over the kidneys, groin, inside the wrists, back of the neck?
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1answer
117 views

DNA Dead skin cells

If the stratum corneum is anucleated, dead cells - how is it that we are able to get DNA from buccal cheek swabs? Are we grabbing more than just the stratum corneum with the swab (eg. the underlying ...
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2answers
1k views

Special visceral efferent

Why are special visceral efferent nerves are named as such? They are supplying motor impulses to muscles of pharyngeal arch, which are both skeletal(facial) and visceral(laryngeal) 1, so why only ...
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0answers
934 views

What are those brown scars in the eyes? [closed]

I have recently realised that one of my friends had brown scars or marks inside his eyes. He says that he doesn't know what they are and has been there since young. What could this possibly be ? Are ...
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1answer
2k views

What is the ratio of head to waist and waist to floor of the human anatomy?

I'm trying to find the ratio of upper body to lower body. That is, the ratio of the length of the waist to the head over the length of the waist to the floor. It's been harder to track down a ...
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1answer
3k views

What is head of a bone?

For most of the long bones head is the proximal end, but for metacarpals and Ulna, head is the distal end. Why are their distal ends called as heads? What's the criteria for calling an end as head ...
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1answer
1k views

Why did humans get rid of their tail in the evolution?

Most mammals seem to have tails. Even human embryos start out with a tail. But here we are with nothing but a tail bone that hurts when we trip over backwards. What is it good for? Why don't humans ...
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211 views

What are the absolute facial features which features sexual dimorphism in humans?

Apart from beard and moustache, is there any facial feature that would help to distinguish between men and women? It is said that men have square, rectangular or oblong face and women have oval,...
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1answer
26 views

How much smaller is the diffusivity of a molecule in the retina as opposed to the vitreous of the eye?

I'm interested in the diffusivity of macromolecules inside the mammalian retina, relative to the vitreous. For example is the diffusion coefficient for a macromolecule (protein, 50-150 kDa for ...
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1answer
124 views

Testosterone level in body with activites

Does ejaculation lower level of testosterone in body, Conflicting reports on internet, a firm answer would help a lot?